Method for preventing coverage gaps on the borders of a cellular mobile communications systems

A method of operating a first cellular communication network in the border region of the first cellular mobile communication network identifiable by an identifier and where a mobile communication terminal to which a communication link exists transmits, at least in border regions of the first mobile communication network, the identification of a second neighboring communication network identified as being equivalent, there being an at least partial spatial overlay of the communication ranges of the two mobile communication networks, the mobile communication terminal measuring the communication signal strengths of the mobile communication networks that can be received at that moment by the mobile communication terminal at the momentary location of the mobile communication terminal, wherein the signal strengths measured by the mobile communication terminal and the associated identifiers of the respective mobile communication network are transmitted to the first mobile communication network for analysis, the communication connection being handed over to the second neighboring mobile communication network if the communication signal strength of this second network exceeds a predetermined threshold value or that is larger than the communication signal strength of the first mobile communication network, and that a check is performed by the second mobile communication network to determine if a right of use exists for the mobile communication terminal in the second mobile communication network, where with an existing right of use the communication connection is taken over by the second mobile communication network and maintained, and that the takeover of the communication connection by the second mobile communication network is rejected if no right of use exists.